I am currently in the process of migrating to a new wallet. I was thinking about just using QT/Core because that seems pretty consistent, but would I run into similar problems?
I have no issues with core. If there is something wrong with it I usually find a way to fix it, either myself or by asking in the tech support section. Some people seem to have problems with their hardware (disk/cpu) running it though.
Mate use whatever else you want, but don't use the blockchain.info. It's the worst wallet out there. You won't have half of the problems with any other wallet that you had with the blockchain.info.